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  • January 9, 2022 at 7:37 pm in reply to: Model without fan/noise #29223
    uRADMonitor
    Keymaster

    The FAN has a dual purpose:
    – it pushes air through a narrow path inside the PM sensor
    – it pushes air across all sensitive elements

    While an open case (A3 Stevenson shield) can take advantage of the natural air convection, wind, or general air movement, the PM sensor will still need a controlled airflow.

    So to make this work, the only option to lower noise is to reduce its frequency, using the sleep mode option.

    On the other hand, the noise itself is ~35dB near the unit, quite low. If you have the A3 you can evaluate that yourself.

    January 9, 2022 at 7:33 pm in reply to: failing VOC sensor? #29222
    uRADMonitor
    Keymaster

    Gopher’s right. You might want to request a RMA. The MOX sensor is very low cost, but sadly we need to arrange shipping the unit back and forth. No other way around this.

    January 9, 2022 at 7:31 pm in reply to: Does Industrial give more accurate temperature than A3? #29221
    uRADMonitor
    Keymaster

    If you can have it installed in a fixed location, there are settings to compensate all its parameters. We can redo your unit’s temperature compensation to have better accuracy.

    January 9, 2022 at 7:29 pm in reply to: expProtocol extra/extended codes? #29220
    uRADMonitor
    Keymaster

    Not all the parameters are yet implemented in the “expProtocol”. It needs an update in this regard. Since there are no particular requirements on the order, you might want to do this yourself, and push your contribution on the github code.

    What do you think?

    define ID_PM1_UGCM “11” // optional: particulate matter in micro grams per cubic meter
    …

    Radu

    December 24, 2021 at 2:40 pm in reply to: Wierd peak results on VOC and Formaldehyde #29166
    uRADMonitor
    Keymaster

    I’d say yes, this is possible. A year is a lot and there can be some drift, regardless of the devices being energised or not. Get them running together and let me know here or via supoort email to check the calibration parameters for the two. Some adjustments are possible.

    September 30, 2021 at 6:47 pm in reply to: Get AQI from JSON #29025
    uRADMonitor
    Keymaster

    You’ll get an AQI value in the summary API return (/devices).

    August 6, 2021 at 12:17 pm in reply to: API integration to android app #28958
    uRADMonitor
    Keymaster

    hi, please find all answers here:
    https://www.uradmonitor.com/wordpress/wp-content/uploads/2021/05/uradmonitor_api_tos.pdf

    August 6, 2021 at 12:16 pm in reply to: A3: CO2 not adjusting for temp ? #28956
    uRADMonitor
    Keymaster

    Ok so apparently we have the conclusion, here’s the input from one of the NDIR CO2 sensor manufacturers:

    in Sauna, high temperatures and high humidity will affect the test result, even worse, will damage the CO2 performance

    I believe replacing the sensor will not help. Simply it will not work ok in high temps.

    Attachments:

    1. WhatsApp-Image-2021-08-06-at-9.48.00-AM.jpeg

    August 2, 2021 at 7:21 pm in reply to: Measure CO2 in a 100°c Sauna ? #28955
    uRADMonitor
    Keymaster

    I opened a discussion with one of the NDIR sensor manufacturers, explaining these requirements to them. In short, they said the high temperature is problematic.

    Your idea with the buffer tube is good, and we did something similar in the past, when several A3s were installed on buses and wanted to have some protection from the high pressure jets used to wash them.

    But on PM2.5/PM10 readings there were two issues: 1) a decrease in amplitude, compared to units running at the outside. 2) a delay in registering the elevated readings, as the air had to slowly travel the tube.

    2) is not a problem for you. With enough time, 1) should reach the real value too. So if you can have this run for let’s say, half an hour, you should get close to the real value found in the hot area. You’ll need a tube + a fan, to force the air from the sauna all the way through.

    Planning on doing this anywhere soon? Let me know if we can help.

    July 10, 2021 at 7:36 pm in reply to: A3: CO2 not adjusting for temp ? #28935
    uRADMonitor
    Keymaster

    Hi,

    I just looked over this . For CO2, your unit uses the MIX6010 from Mixsen, very similar to the MH-Z19B presented by Wolferl. These are both classic NDIR single beam CO2 sensors.

    The results you are getting are strange. I suggest you return the unit and I’ll upgrade it to a different, dual-beam CO2 sensor . See http://www.uradmonitor.com/rma

    July 10, 2021 at 7:26 pm in reply to: formatos fecha y hora #28934
    uRADMonitor
    Keymaster

    Hola,

    Also see https://www.youtube.com/watch?v=6P6reXvc5UE for a quick example on how you can convert the timestamps yourself.

    July 10, 2021 at 7:25 pm in reply to: How to upload to uRadmonitor from (Arduino) ESP32? #28933
    uRADMonitor
    Keymaster

    Up for writing a short blog post on this ?

    July 10, 2021 at 7:23 pm in reply to: Making a clicker #28931
    uRADMonitor
    Keymaster

    Nothing fancy there, really, these were some 3.3V (5V is good too) active buzzers . They are controlled with a NPN transistor so you can use pretty much anything. You can also connect a LED instead. Here is another link: https://www.aliexpress.com/item/33059794164.html and a picture attached.

    Attachments:

    1. U769ee342818e41019da42e53d90031d8c.jpg

    July 10, 2021 at 7:19 pm in reply to: uRADMonitor Model A – yet another Outdoor installation example #28930
    uRADMonitor
    Keymaster

    This is awesome, congrats! Reading this nice construction log I felt it would be a good fit for the blog, on a dedicated blog post. Definitely you could add more pics and details there.

    June 21, 2021 at 10:12 am in reply to: Introduce Yourself! #28909
    uRADMonitor
    Keymaster

    Welcome Rob and thank you.

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